diff --git a/lib/logger/flag.go b/lib/logger/flag.go
index 74a5963f9..1383cad94 100644
--- a/lib/logger/flag.go
+++ b/lib/logger/flag.go
@@ -11,20 +11,12 @@ import (
 func logAllFlags() {
 	Infof("build version: %s", buildinfo.Version)
 	Infof("command line flags")
-	isSetMap := make(map[string]bool)
 	flag.Visit(func(f *flag.Flag) {
-		isSetMap[f.Name] = true
-	})
-	flag.VisitAll(func(f *flag.Flag) {
 		lname := strings.ToLower(f.Name)
 		value := f.Value.String()
 		if flagutil.IsSecretFlag(lname) {
 			value = "secret"
 		}
-		isSet := "false"
-		if isSetMap[f.Name] {
-			isSet = "true"
-		}
-		Infof("flag %q=%q (is_set=%s)", f.Name, value, isSet)
+		Infof("flag %q=%q", f.Name, value)
 	})
 }